public final class ComputedAttribute extends AttributeCreator
selectEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
|---|
ComputedAttribute(Expression attributeName,
Expression namespace,
NamespaceResolver nsContext,
int validationAction,
SimpleType schemaType,
boolean allowNameAsQName)
Construct an Attribute instruction
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| Modifier and Type | Method and Description |
|---|---|
void |
checkPermittedContents(SchemaType parentType,
StaticContext env,
boolean whole)
Check that any elements and attributes constructed or returned by this expression are acceptable
in the content model of a given complex type.
|
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
|
Expression |
copy()
Copy an expression.
|
Item |
evaluateItem(XPathContext context)
Evaluate as an expression.
|
NodeName |
evaluateNodeName(XPathContext context)
Determine the name to be used for the attribute, as an integer name code
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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int |
getCardinality()
Get the static cardinality of this expression
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the ComputedAttribute expression
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int |
getInstructionNameCode()
Get the name of this instruction
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ItemType |
getItemType(TypeHierarchy th)
Get the static type of this expression
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Expression |
getNameExpression()
Get the expression used to compute the name of the attribute
|
Expression |
getNamespaceExpression()
Get the expression used to compute the namespace part of the name of the attribute
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NamespaceResolver |
getNamespaceResolver()
Get the namespace resolver used to resolve any prefix in the name of the attribute
|
Expression |
getOnEmpty()
Get the on-empty expression, which defines the value to be returned if the attribute would otherwise
be empty
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boolean |
isAllowNameAsQName()
Ask whether it is allowed for the name to be evaluted as an xs:QName instance (true in XQuery)
|
Iterator<SubExpressionInfo> |
iterateSubExpressionInfo()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
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Iterator<Expression> |
iterateSubExpressions()
Get the subexpressions of this expression
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void |
localTypeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Method to perform type-checking specific to the kind of instruction
|
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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void |
processValue(CharSequence value,
XPathContext context)
Process the value of the node, to create the new node.
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protected void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions.
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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void |
setOnEmpty(Expression onEmpty)
Set the on-empty expression, which defines the value to be returned if the attribute would otherwise
be empty
|
void |
setRejectDuplicates()
Indicate that two attributes with the same name are not acceptable.
|
Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression.
|
getOptions, getSchemaType, getValidationAction, setNoSpecialChars, setOptions, setSchemaType, setValidationAction, validateOrphanAttributecheckContent, computeCardinality, createsNewNodes, getContentExpression, getStreamingAdjunct, iterate, processLeavingTail, setSelect, typeCheckassembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, process, promoteaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, toString, typeErrorclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitgetColumnNumber, getLineNumber, getPublicId, getSystemIdpublic ComputedAttribute(Expression attributeName, Expression namespace, NamespaceResolver nsContext, int validationAction, SimpleType schemaType, boolean allowNameAsQName)
attributeName - An expression to calculate the attribute namenamespace - An expression to calculate the attribute namespacensContext - a NamespaceContext object containing the static namespace context of the
stylesheet instructionvalidationAction - e.g. validation=strict, lax, strip, preserveschemaType - Type against which the attribute must be validated. This must not be a namespace-sensitive
type; it is the caller's responsibility to check this.allowNameAsQName - true if the attributeName expression is allowed to evaluate to a value
of type xs:QName (true in XQuery, false in XSLT)public void setOnEmpty(Expression onEmpty)
onEmpty - the expression to be evaluated if the attribute would otherwise be emptypublic Expression getOnEmpty()
public void setRejectDuplicates()
setRejectDuplicates in class AttributeCreatorpublic int getInstructionNameCode()
getInstructionNameCode in class Instructionpublic Expression getNameExpression()
public Expression getNamespaceExpression()
public NamespaceResolver getNamespaceResolver()
public ItemType getItemType(TypeHierarchy th)
getItemType in class AttributeCreatorth - the type hierarchy cachepublic int getCardinality()
getCardinality in class Expressionpublic boolean isAllowNameAsQName()
public int computeSpecialProperties()
computeSpecialProperties in class AttributeCreatorpublic Expression simplify(ExpressionVisitor visitor) throws XPathException
Instructionsimplify in class SimpleNodeConstructorvisitor - an expression visitorXPathException - if an error is discovered during expression
rewritingpublic void localTypeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
SimpleNodeConstructorlocalTypeCheck in class SimpleNodeConstructorvisitor - an expression visitorcontextItemType - the static type of the context itemXPathException - if a type error is detectedpublic Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
ExpressionThis method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class SimpleNodeConstructorvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression copy()
copy in class Expressionpublic Iterator<Expression> iterateSubExpressions()
iterateSubExpressions in class SimpleNodeConstructorpublic Iterator<SubExpressionInfo> iterateSubExpressionInfo()
SimpleNodeConstructoriterateSubExpressionInfo in class SimpleNodeConstructorpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class SimpleNodeConstructororiginal - the original subexpressionreplacement - the replacement subexpressionprotected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst in class SimpleNodeConstructoroffer - details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expressionXPathException - if any error is detectedpublic void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException
checkPermittedContents in class ExpressionparentType - the "given complex type": the method is checking that the nodes returned by this
expression are acceptable members of the content model of this typeenv - the static contextwhole - if true, we want to check that the value of this expression satisfies the content model
as a whole; if false we want to check that the value of the expression is acceptable as one part
of the contentXPathException - if the value delivered by this expression cannot be part of the content model
of the given typepublic NodeName evaluateNodeName(XPathContext context) throws XPathException
evaluateNodeName in class SimpleNodeConstructorcontext - Dynamic evaluation contextXPathExceptionpublic void processValue(CharSequence value, XPathContext context) throws XPathException
processValue in class AttributeCreatorvalue - the string value of the new nodecontext - the dynamic evaluation contextXPathExceptionpublic Item evaluateItem(XPathContext context) throws XPathException
SimpleNodeConstructorevaluateItem in class SimpleNodeConstructorcontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structureCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.